Clarify supported versions in SECURITY.md after v0.9.2 release

Summary

SECURITY.md currently lists only 0.8.x under supported versions, while the current stable release is v0.9.2.

Evidence

• GitHub's latest non-prerelease is v0.9.2, published on 2026-07-15 from the current main commit.
• PyPI publishes non-yanked crawl4ai 0.9.2 wheel and source distributions from the same date.
• Both the main and develop branches currently report __version__ = "0.9.2".
• The supported-versions table in SECURITY.md still lists only the 0.8.x line.

Question

Could the maintainers clarify whether 0.9.x is supported and update the table accordingly, or whether the policy intentionally covers only 0.8.x?

This is a documentation clarification only; no vulnerability details are involved.